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practical Software project estimation
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estimation align with those used in Agile development This alignment includes references to project iterations and stories Story point based estimation can be completed quickly and easily and does not require the developers responsible for the estimates to perform significant additional analysis or to have additional specialist skills Estimation can be incorporated into the standard planning sessions prior to the start of each project iteration Story point based estimation supports the Agile principle of developers taking ownership and responsibility for the software they will deliver Estimates are created by the developers themselves Developers therefore understand that poorly considered estimates can have a direct impact on their own work situation Story point based estimation supports appropriate input into the estimation process by the different project roles Once again, the developers who are required to deliver the software provide the development estimates Occasional lapses of judgment or lack of understanding by an individual developer are mitigated through the use of a Wide-Band Delphi approach Business representatives provide additional descriptions and clarifications of software requirements when and if needed
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Comparing Story Points and Function Points
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Story point based estimation is sometimes compared to and contrasted with Function Point Analysis based estimation Both techniques focus on identifying, sizing, and devising sizeto-effort, size-to-cost, or size-to-schedule ratios for the features that a software project will deliver into production For story point based estimation these features are the collection of project stories, whereas for Function Point Analysis based estimation they are the collection of data and transactional functions Where story points differ most from function points, however, is that while function points endeavor to be an absolute measure of feature size, story points are explicitly a relative measure This means that whereas applying Function Point Analysis to a particular collection of software requirements should always lead to identification of the same number of function points, determining the number of story points related to a particular collection of software requirements can lead to completely different numbers and depends entirely upon the story point scale used in each situation For story points, one claimed major advantage of being a relative sizing technique is that it can be quickly learned and applied as needed in a particular context Unlike with Function Point Analysis,
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estimating for agile Software Development
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the use of story points does not require that estimators learn and understand a full set of sometimes complex and prescriptive rules and guidelines On the other hand, potential disadvantages of a relative sizing technique such as story points over an absolute technique such as Function Point Analysis are as follows: The use of story points requires recalibration within each organization and potential development team in which they are used It is difficult to use external repositories as sources of information on likely development team story point velocity Story points cannot be easily used for comparative benchmarking across organizations There is no authoritative source against which to assess the correctness and consistency of project sizing
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The Agile approach to software development differs markedly from traditional development approaches such as Waterfall As such, Agile requires its own method of estimation In this chapter we have provided a brief introduction to Agile software development estimation and described the sizing process using either story points or function points
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a Guide to estimating project Cost Using ISBSG Data
lthough the ISBSG collects the costs incurred by projects as a project attribute in its repository, it is very difficult to standardize these costs as a ratio of dollar cost per function point delivered that can be used to predict the likely cost of a newly planned project Difficulties in using other projects total costs arise due to the following factors: The costs submitted to the ISBSG are provided in a wide range of currencies Projects are submitted to the ISBSG over many years, and the currency conversion rates to a standard currency such as the euro or US dollar vary significantly as economies strengthen and weaken relative to each other Since the dates that the project costs were collected are not known, it is not possible to allow for any subsequent inflation that may have occurred It is therefore recommended that in order to estimate your project s costs, you should use the predicted project effort, and convert the effort to cost using current relevant personnel resource costs That is, use the effort predicted by the PDR combined with the hourly charge-out rates for the particular project team in the currency in which they will be paid, allowing for the inflation over the proposed project duration This chapter explains how this can be done and the types of considerations that need to be allowed for prior to committing a monetary value to a project
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